Cluster gas burner



Feb; 8, 1955 A. w. CARLSON 2,701,610

CLUSTER GAS BURNER Filed Feb. 21, 1951 2 Sheets-Sheet l INVENTOR. Arthur W. Carlson ATTORNEYS.

Feb. 8, 1955 A. w. CARLSON 2,701,610

CLUSTER GAS BURNER Filed Feb. 21. 1951 2 Sheets-Sheet 2 Arthur W. Carlson l7 /5 BY ATTORNEYS.

United States Patent CLUSTER GAS BURNER Arthur W. Carlson, Kankakee, Ill., assignor to A. 0. Smith Corporation, Milwaukee, Wis., a corporation of New York Application February 21, 1951, Serial No. 212,020

7 Claims. (Cl. 158-104) This invention relates generaly to a gas burner and particularly to a cluster type gas burner formed of sheet meta The principal object of the invention is to provide a multiple cluster gas burner which is formed of sheet metal and of relatively few parts thereby effecting appreciable savings in the manufacture of the same.

Another object is to provide a multiple cluster gas burner in which the top of the burner is formed of two members, the upper member of which is pressed or stamped and provided with a plurality of apertures with stiffening flanges disposed circumferentially of each aperture, and a flat bottom member having its edges crimped over the upper member.

Another object is to provide a gas burner in which the venturi comprises a plurality of sheet metal stampings secured together by crimping in one instance and utilizing spot welds in securing a mixer plate to the venturi.

A still further object is to provide a multiple cluster burner in which the bases of the burner heads are secured to the bottom pan of the burner base in leakproof manner to provide a gastight seal.

Still another object is to provide a multiple cluster gas burner having a coating of ceramic enamel fused to both the inner and outer surfaces of the burner to close any leaks that might otherwise be present due to crimping the various parts together.

Another object is to provide a method for fabricating a multiple cluster gas burner in accordance with the above objects.

These and other objects will appear from the specification when taken in conjunction with the drawing in which:

Fig. 1 is a top plan view of the cluster burner of the invention;

Fig. 2 is a section taken on line 22 of Fig. 1;

Fig. 3 is a top plan view of the mixer;

Fig. 4 is a longitudinal elevational view of the mixer;

Fig. 5 is a top plan view of the bottom plate of the burner body;

Fig. 6 is a section taken on line 6-6 of Fig. 5;

Fig. 7 is a face view of the mixer plate;

Fig. 8 is an edge view of the mixer plate;

Fig. 9 is a face view of the air shutter;

Fig. 10 is a top plan view of the burner head;

Fig. 11 is an elevational view of the burner head; and

Fig. 12 is an enlarged detail section of a venturi joint showing the sealing effect of the enamel coating.

In accordance with the invention the multiple cluster gas burner comprises essentially a sheet metal burner body 1 and a sheet metal venturi or mixer 2 which is secured to the burner body preferably by crimping together flanges which extend outwardly from the outer edges of the respective members.

Burner body 1, as shown in Fig. l and Fig. 2, comprises a top 3, preferably of sheet metal and formed to provide a substantially hollow chamber 4. A plurality of apertures 5 are disposed in the top surface of member 3. Each aperture 5 1s circumferentially bounded by the depending flange 6, the upper edge of which is curved outwardly to provide shoulder 7 from whence the sheet metal is formed outwardly and downwardly in generally outwardly extending flared members 8 and 9 which blend into one another so that there are no abrupt junctions to 1mpede the flow of gas and air mixture to the burners. The inner edge of member 9 is formed outwardly to provide a flange 10 which extends around the outer circumference of the top member 3 and gradually becomes of greater width at 11 in its extension to the rear of the burner body top.

Between the apertures 5, the top member 3 is formed inwardly at 12 to provide curved surfaces of lesser depth than those formed by the combination of members 8 and 9, while between the inner edges of members 8 nearest the center unit, the body is formed substantially flat at 13 and to a depth substantially equal to the depth of curved surface 12. The rear portion of surface 13 is flared upwardly to provide a hood 14 which extends downwardly at 15 at the extreme rear of the body 3 into the outwardly disposed flange at 11. Hood 14 is formed downwardly to either side and then extends outwardly toward the edge of the body to provide the substantially flat surfaces 16. The outer edges of these surfaces are disposed downwardly substantially normal to surfaces 16 and terminate in the outwardly disposed flange 11.

Burner body bottom 17, as best seen in Fig. 5, comprises a sheet metal stamping and is of a configuration generally conforming to the outer circumferential outline of the top 3. A plurality of apertures 18 having circiunferential stiffening flanges 19 are spaced so that their centers are adapted to be disposed in vertical alignment with the centers of apertures 5 in top 3. "lhe flanges 19, extend upwardly from the bottom 17 and terminate in upstanding circular flanges 20.

The outer edge of the bottom is turned upwardly to provide a flange 21 and of a depth sufiicient to adapt it to be crimped over the flanges 10 and 11 extending around the top member 3. A generally triangular shaped aperture 22 is disposed adjacent the rear of the bottom and provides a passageway for a mixture of air and gas from the venturi to the burner body.

As best seen in Figs. 3 and 4, the mixer or venturi 2 is comprised of a hollow semicircular top 23 and a hollow semicircular bottom 24 having a generally restricted crosssection to form throat 25, when assembled. One outer end of the venturi is flared outwardly from the throat 25 to provide a bell-shaped inlet end 26. The opposite end of the mixer bottom is formed to provide a hollow cup-like generally triangular shaped member 27 adapted to cooperate with hood 14 of the burner body top 3 when assembled therewith, to reverse the direction of flow of the mixture of gas and air from the venturi and to direct the same; to a plurality of burner heads disposed in the top The venturi bottom 24 is provided with an outwardly disposed right angled flange 28 which extends longi tudinally from adjacent the end of the bell-shaped inlet 26 to adjacent the inner end of member 27. This latter member is formed adjacent the outlet end of the venturi with vertically disposed side walls 29 which flare outwardly to form the end 27. Flange 30 is disposed outwardly of walls 29 and extends around the cup-like member 27. It will be noted that the right angled flange 28 does not extend entirely to the inner end of the bellshaped inlet thereby providing a shoulder 31 to receive a mixer plate as later described. 1

The venturi top 23 is hollow and conforms generally to the bottom 24 of the venturi so that when the members 23 and 24 are assembled and secured together a complete venturi is provided. Flange 32 extends outwardly from the lower edge of the top 23 and longtudinally thereof to an extent commensurate with the flange 28 section between the top and sides of the member 23.

When assembled, the side walls 34 are disposed inwardly of and against the side walls 29 at the inner end of member 27.

A circular mixer plate 35, has a circumferentially disposed flange 36 formed normal to the plate. Apertures 37 of suitable shape are disposed at opposite sides of plate 35 and an aperture 38 extends therethrough for the reception of a metal screw to secure an air shutter to the plate. An opening 39 is disposed centrally of the plate to receive a supply of gas for the burner while the apertures 37 permit air to enter the venturi for mixing with the gas. The flange 36 is adapted to be disposed on the shoulder 31 at the outer end of the bell-shaped inlet 26.

Air shutter 40 having a circumferentially and normally disposed flange 41 and a centrally disposed flanged opening 42 is adapted to be disposed outwardly of and against mixer plate 35 with the flange of opening 42 disposed in opening 39. Apertures 43 similar in shape to apertures 37 in the mixer plate, are disposed in the air shutter and are movable with respect to the former to control the amount of air permitted to pass to the venturi. One of the apertures is provided with a cut out portion 44 extending outwardly from the circumference thereof and is adapted to receive metal screw 4-5 for holding the air shutter in any selected position relative to the mixer plate.

Cup-shaped burner heads 46 preferably of stainless steel comprise a bottom 47 having an opening 48 disposed centrally thereof. Walls 49 extend outwardly for a short distance and then upwardly normal to the plane of the bottom. The top edges of walls 49 are formed outwardly and then downwardly in parallel relationship to the upper portion of the walls and are serrated to provide a plurality of ports 50 which extend from the upper curved portion of the outwardly extending walls at their upper circumferential edge to the bottom circumferential edge of the lip 51. The burner heads are formed to a smaller circumference than the apertures in top 3, to fit loosely therein with the lower circumferential edge of lips 51 being disposed on shoulders 7. Openings 48 in burner heads 46 are disposed in vertical alignment with apertures 18 in the bottom 17 of the burner head when the two members are in assembled relationship.

A gasket 52 of asbestos or other suitable material is disposed between the bottom of the burner head and the burner bottom and encircles the openings 48 and 18 respectively. Hollow grommets 53, preferably brass, and having a circular bottom 54 and a wall 55 disposed normally to the bottom are inserted upwardly through the openings 18 and 48. The top edge of the grommet is peened outwardly against the inner bottom surface of the burner heads to clamp the gasket in place and to provide leaktight joints between the burner heads and the bottom of the burner body. The insides of the burners are sufiiciently aerated with secondary air through the above described openings.

Bracket 56 for a pilot is disposed outwardly of the multiple cluster burner and is secured to the outer surface of the bottom 17 by spot welds 57 between the bottom 17 and inwardly extending legs 58 of the bracket.

In assembling the various parts of the multiple cluster gas burner of the invention the mixer top 23 is disposed on mixer bottom 24 so that flanges 32 of the former are disposed within the angular flange 28 of the bottom. The upstanding leg of flange 28 is crimped over flange 32 to secure the top and bottom of the mixer 2 together. The circumferentially disposed flange 36 of mixer plate 35 is spot welded to the outer circumferential shoulder of the bell-shaped inlet 26. The assembled mixer is next secured to the bottom 17 of the burner body by a plurality of projection welds 59 between the bottom 17 and the flange 30 of the mixer bottom as best seen in Fig. l.

The top 3 of the burner body is then disposed on the bottom 17 so that the flange is disposed within the flange 21 of the bottom 17. Flange 2.1 is crimped over flange 10 with its widest portion 11 disposed at the rear of the unit.

The burner body and the mixer thus assembled together, are provided on their inner and outer surfaces with a lining or coating of vitreous enamel 60 which is fused thereto. The inner surfaces of the circumferential flanges are left bare of the vitreous enamel to insure a metal-to-metal contact between these surfaces and the hollow brass grommet disposed therein.

Burner heads 46 are disposed in apertures 5 with the circumferential lip 51 abutting shoulder 7 and a gasket 52 is disposed between the bottoms 47 of each burner head and the upper surface of the bottom of the body. The grommets are inserted from the under side of the bottom of the body through the apertures 18 and 48 and the upper circumferential edge of the grommets crimped over onto the inner surface of the bottom 47 to hold the burner heads in leakproof engagement with the bottom. The air shutter may be removably secured to the mixer plate with metal screw 45 either before or after the burner heads are installed in place.

Fig. 2 shows clearly the path traveled by the gas and the entrained air from the mixer plate to the burner heads. The mixture of primary air and gas passes rearwardly through the venturi until it contacts the curved surfaces of the rear of the mixer bottom and at the rear of the burner body top from whence the mixture stream is turned and delivered to the burner heads with a minimum of pressure loss. The mixture discharges and burns at the ports of the stainless steel burner heads.

Secondly air is supplied to the inside of the burner heads through openings 48 in the bottoms 47 of the heads 4-6. Tests have disclosed that no other secondary air is necessary and that complete combustion of the gas is effected as indicated by the complete absence of carbon monoxide in the products of combustion.

The above invention provides a multiple cluster gas burner formed from sheet metal stampings. The burner body is comprised of two parts, the upper having a plurality of apertures disposed therein for the reception of cup-shaped stainless steel burner heads and the bottom part being substantially flat and having a plurality of openings therein to receive a brass ferrule centrally thereof which projects through the openings. A gastight seal is efiected for each burner by disposing an asbestos gasket between the bottom and the burner and clamping the same therebetween by pressing the flange of the ferrule over against the bottom of the burner head to hold the latter firmly in place.

The above described gas burner is relatively simple to construct in that it is made up of a minimum number of parts and is also relatively cheap to produce in that no castings are involved. Providing a coating of vitreous enamel to certain members of the burner, as above explained, seals the joints between the members to give a leakproof unit.

Various embodiments of the invention may be employed within the scope of the following claims.

I claim:

1. A cluster type gas burner comprising a body formed of two sheets of metal juxtaposed and crimped together around the edges thereof, the upper sheet being formed upwardly and being spaced from the lower sheet for a major portion of its area to provide a gas chamber for the burner, said upper sheet having at least one upwardly extending circular flange defining an opening in said sheet, a cup-shaped burner head disposed in said opening and having a bottom and side wall and a slotted flange extending outwardly from the upper edge of said wall and adapted to be supported on the circumferential edge of said opening, said bottom having an opening disposed centrally thereof, said bottom sheet having at least one opening disposed therein and adapted for vertical alignment with the opening in the burner head to supply secondary air thereto, means disposed between the bottom of the burner head and the lower sheet to secure the same together in leakproof juxtaposition, a venturi disposed subjacent to and parallel with the body and formed of sheet metal upper and lower members crimped together around the edges thereof, said lower member having a rearwardly extending and upwardly curved extension and being crimped to the burner body around a portion of the edge thereof and secured to the outer surface of the lower body sheet by projection welds, said lower body sheet having an opening therein communicating with the venturi to provide a passageway for a mixture of gas and primary air to the body, a mixer plate secured to an end of the venturi, a rotatably adjustable air shutter removably secured to the outer surface of the mixer plate, and a coating of vitreous enamel fused to the inner and outer surfaces of the gas burner and around the edges thereof to prevent leakage of gas and air from within the burner body and venturi to the atmosphere.

2. A cluster type gas burner comprising a body formed of two sheets of metal juxtaposed and crimped together around the edges thereof, the upper sheet being formed upwardly and being spaced from the lower sheet for a major portion of its area to provide a gas chamber for the burner, said upper sheet having at least one upwardly extending circular flange with a stiffening fold at the upper edge thereof and defining an opening in said sheet, a cup-shaped burner head disposed in said opening and having a bottom wall having an opening therein side wall and a slotted flange extending outwardly from the upper edge of said wall and adapted to be supported on the stiffening fold of said flange, said bottom sheet having at least one opening disposed therein and adapted to be disposed in vertical alignment with the opening in the burner head to supply secondary air thereto, means disposed between the bottom of the burner head and the lower sheet to secure the same together in leakproof juxtaposition, a venturi formed of sheet metal and having an upper and lower member and crimped together around the edges thereof and disposed subjacent to and parallel to the body of the burner, said lower member having a rearwardly extending and upwardly curved hollow portion and being crimped to the burner body around a portion of the edge thereof and secured to the outer surface of the lower body sheet by projection welds, said lower body sheet having an opening adjacent one end thereof communicating with the hollow portion of the venturi to provide a passageway for a mixture of gas and primary air to the body, a mixer plate secured to an end of the venturi, a rotatably adjustable air shutter removably secured to the outer surface of the mixer plate, and a coating of vitreous enamel fused to the inner and outer surfaces of the body and venturi and around the edges thereof to prevent leakage of gas and air from within the burner body and venturi to the atmosphere.

3. A cluster type gas burner comprising a body formed of two sheets of metal juxtaposed and crimped together around the edges thereof, the upper sheet being formed upwardly and being spaced from the lower sheet for a major portion of its area to provide a gas chamber for the burner, said upper sheet having at least one upwardly extending circular flange with a stiffening fold at the upper edge thereof and defining an opening 1n said sheet, a cup-shaped burner head disposed in said opening and having a bottom wall having an opening therein side wall and a slotted flange extending outwardly from the upper edge of said wall and adapted to be supported on the stiffening fold of said flange, said bottom sheet having at least one opening disposed therein and adapted to be disposed in vertical alignment with the opening in the burner head to supply secondary air thereto, means disposed between the bottom of the burner head and the lower sheet to secure the same together in leakproof juxtaposition, a venturi formed of sheet metal and having an upper and lower member and crimped together around the edges thereof and disposed subjacent to and parallel to the body of the burner, said lower member having a rearwardly extending and upwardly curved hollow portion and being crimped to the burner body around a portion of the edge thereof and secured to the outer surface of the lower body sheet by projection welds, said upper member of the venturi having a rearwardly disposed extension of substantially open rectangular shape adapted to be disposed against the outer surface of the lower body sheet and against the inner surface of the extension of the lower member of the venturi, said lower body sheet having an opening adjacent one end thereof communicating with the venturi to provide a passageway for a mixture of gas and primary air to the body, and a coating of vitreous enamel fused to the inner and outer surfaces of the body and venturi and around the edges thereof to prevent leakage of gas and air from within the burner body and venturi to the atmosphere.

4. A cluster type gas burner comprising a body formed of two sheets of metal juxtaposed and crimped together around the edges thereof, the upper sheet being formed upwardly and being spaced from the lower sheet for a major portion of its area to provide a gas chamber for the burner, said upper sheet having at least one circular stiffening flange defining an opening in said sheet, a cup-shaped burner head disposed in said opening and having a bottom and side wall and a slotted flange extending outwardly from the upper edge of said wall and adapted to be supported on the circumferential edge of said opening, said bottom having an opening disposed centrally thereof, said bottom sheet having at least one opening disposed therein and adapted for vertical alignment with the opening in the burner head to supply secondary air thereto, means disposed between the bottom of the burner head and the lower sheet to secure the same together in leakproof juxtaposition, a venturi disposed subjacent to and parallel with the body and formed of sheet metal upper and lower members crimped together around the edges thereof, said lower member having a rearwardly extending and upwardly curved extension and being crimped to the burner body around a portion of the edge thereof and secured to the outer surface of the lower body sheet by projection welds, said lower body sheet having an opening therein communicating with the venturi to provide a passageway for a mixture of gas and primary air to the body, a mixer plate secured to an end of the venturi, a rotatably adjustable air shutter removably secured to the outer surface of the mixer plate, and a coating of vitreous enamel fused to the inner and outer surfaces of the gas burner and around the edges thereof to prevent leakage of gas and air from the burner body and venturi to the atmosphere.

5. A multiple cluster gas burner comprising a body formed of two sheets of metal juxtaposed and crimped together around the edges thereof, the upper sheet being formed upwardly and being spaced from the lower sheet for a major portion of its area to provide a gas chamber for the burner, said upper sheet having a plurality of generally triangularly spaced circular stiffening flanges defining openings in said sheet, cup-shaped burner heads disposed in corresponding openings and each having a bottom and side wall and a slotted flange extending outwardly from the upper edge of the wall and adapted to be supported on corresponding stiffening flanges, each said bottom having an opening disposed centrally thereof, said bottom sheet having a plurality of spaced openings disposed therein and adapted for vertical alignment with corresponding openings in the burner head to supply secondary air thereto, means disposed between the bottom of the burner head and the lower sheet to secure the same together in leakproof juxtaposition, a venturi disposed subjacent to and centrally longitudinally of the body and formed of sheet metal upper and lower members crimped together around the edges thereof, said lower member having a rearwardly extending and upwardly curved extension and being crimped to the burner body around a portion of the edge thereof and secured to the outer surface of the lower body sheet by projection welds, said lower body sheet having an opening therein communicating with the venturi to provide a passageway for a mixture of gas and primary air to the body and a coating of vitreous enamel fused to the inner and outer surfaces of the body and the venturi and around the edges thereof to prevent leakage of gas and air from within the burner body and venturi to the atmosphere.

6. A multiple cluster gas burner comprising a body formed of two sheets of metal juxtaposed and crimped together around the edges thereof, the upper sheet being formed upwardly and being spaced from the lower sheet for a major portion of its area to provide a gas chamber for the burner, said upper sheet having a plurality of generally triangular spaced circular stiffening flanges defining openings in said sheet, cup-shaped burner heads disposed in corresponding openings and each having a bottom and side wall and a slotted flange extendmg outwardly from the upper edge of the wall and adapted to be supported on corresponding stiffening flanges, each said bottom having an opening disposed centrally thereof, said bottom sheet having a plurality of spaced openings disposed therein and adapted for vertical alignment with corresponding openings in the burner head to supply secondary air thereto, means disposed between the bottom of the burner head and the lower sheet to secure the same together in leakproof juxtaposition, a venturi disposed subjacent to and centrally longitudinally of the body and communicating with the interior of the body through an opening in the lower body sheet and formed of sheet metal upper and lower members crimped together around the edges thereof, said lower member having a rearwardly extending and upwardly curved extension and being crimped to the burner body around a portion of the edge thereof and secured to the outer surface of the lower body sheet by pro ection welds, and disposed to complement a curved portion of the upper body sheet to reverse the direction of flow of gas and primary air from said venturi to the burners and a coating of vitreous enamel fused to the inner and outer surfaces of the body and venturi and around the edges thereof to prevent leakage of gas and air from within the burner body and venturi to the atmosphere.

7. A cluster type gas burner comprising a body formed of two sheets of metal juxtaposed and crimped together around the edges thereof, the upper sheet being formed upwardly and being spaced from the lower sheet for a major portion of its area to provide a gas chamber for the burner and having a dome-shaped portion disposed adjacent one end thereof, said upper sheet having at least one upwardly extending circular flange defining an opening in said sheet, a cup-shaped burner head having a bottom and side wall disposed in said opening and having a slotted flange extending outwardly from the top edge of the wall and adapted to be supported on the circumferential edge of said opening, an opening disposed centrally of the bottom of the burner head, said bottom sheet having at least one opening disposed therein and adapted for vertical alignment with the opening'in the bottom of the burner head, means disposed between the bottom of the burner head and the bottom sheet to secure the same together in leakproof juxtaposition, a venturi disposed subjacent to and parallel with the body and communicating with the interior of the body through an opening in the lower body sheet and formed of sheet metal upper and lower members crimped around the edges thereof, said lower member having a rearwardly and upwardly curved dome-shaped extension complementing the dome-shaped portion of the body to provide reversal in the direction of flow of a gas and primary air mixture from the venturi to the burner head disposed in the body, said upper sheet and lower sheet of the body being crimped at one end of the body and secured to the dome-shaped extension of the ven-, turi by crimping at the opposite end thereof, and a coating of vitreous enamel fused to the inner and outer surfaces of the body and venturi and to the joints therebetween to prevent leakage of gas and air from within the burner body and venturi to the atmosphere.

References Cited in the file of this patent X UNITED STATES PATENTS 839,454 Clunies Dec. 25, 1906\ 2,470,881 Zimbelman May 24, 1949 2,497,787 Minster 1.. Feb. 14, 1950 2,539,101 Reeves Jan. 23, 1951 2,595,005 Shelton et al Apr. 29, 1952 

